280215 has 24 divisors (see below), whose sum is σ = 524160. Its totient is φ = 137664.

The previous prime is 280207. The next prime is 280219. The reversal of 280215 is 512082.

It is not a de Polignac number, because 280215 - 2³ = 280207 is a prime.

280215 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280215.

It is not an unprimeable number, because it can be changed into a prime (280219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (21840).

2²⁸⁰²¹⁵ is an apocalyptic number.

280215 is a deficient number, since it is larger than the sum of its proper divisors (243945).

280215 is a wasteful number, since it uses less digits than its factorization.

280215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 280215 is about 529.3533791334. The cubic root of 280215 is about 65.4380666639.

Adding to 280215 its reverse (512082), we get a palindrome (792297).

The spelling of 280215 in words is "two hundred eighty thousand, two hundred fifteen".